Enable health checking for HAProxy backend servers

- Updated HAProxy configuration templates to include `check` for `srv_stats` and `srv_dashboard` backends.
- Adjusted expected test case outputs to account for the added health check settings.

Author: byjg

deploy/docker/assets/etc/easyhaproxy/www/dashboard.html

@@ -90,7 +90,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:{{ data_stats["port"] | default(1936) }}
+    server Local 127.0.0.1:{{ data_stats["port"] | default(1936) }} check
 
 frontend dashboard
     bind *:{{ (data_stats["port"] | default(1936) | int) + 10000 }}
@@ -104,7 +104,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:{{ dashboard_server_port }}
+    server Local 127.0.0.1:{{ dashboard_server_port }} check
 {% endif %}
 {% for o in data["easymapping"] -%}
     {% set mode = o["mode"] or "http" %}

docs/dashboard.png

@@ -35,7 +35,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:1936
+    server Local 127.0.0.1:1936 check
 
 frontend dashboard
     bind *:11936
@@ -49,7 +49,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:9190
+    server Local 127.0.0.1:9190 check
 
 frontend http_in_443
     bind *:443  ssl crt /etc/easyhaproxy/certs/certbot/ alpn h2,http/1.1 crt /etc/easyhaproxy/certs/haproxy/ alpn h2,http/1.1

src/templates/haproxy.cfg.j2

@@ -43,7 +43,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:1936
+    server Local 127.0.0.1:1936 check
 
 frontend dashboard
     bind *:11936
@@ -57,7 +57,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:9190
+    server Local 127.0.0.1:9190 check
 
 frontend http_in_80
     bind *:80

tests/expected/docker.txt

@@ -43,7 +43,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:1937
+    server Local 127.0.0.1:1937 check
 
 frontend dashboard
     bind *:11937
@@ -57,7 +57,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:9190
+    server Local 127.0.0.1:9190 check
 
 frontend http_in_19901
     bind *:19901

tests/expected/services-letsencrypt.txt

@@ -33,7 +33,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:1936
+    server Local 127.0.0.1:1936 check
 
 frontend dashboard
     bind *:11936
@@ -47,7 +47,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:9190
+    server Local 127.0.0.1:9190 check
 
 backend certbot_backend
     mode http

tests/expected/services-multiple-hosts.txt

@@ -50,7 +50,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:1936
+    server Local 127.0.0.1:1936 check
 
 frontend dashboard
     bind *:11936
@@ -64,7 +64,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:9190
+    server Local 127.0.0.1:9190 check
 
 frontend http_in_80
     bind *:80

tests/expected/ssl-loose.txt

@@ -43,7 +43,7 @@ frontend stats
 
 backend srv_stats
     mode http
-    server Local 127.0.0.1:1936
+    server Local 127.0.0.1:1936 check
 
 frontend dashboard
     bind *:11936
@@ -57,7 +57,7 @@ frontend dashboard
 
 backend srv_dashboard
     mode http
-    server Local 127.0.0.1:9190
+    server Local 127.0.0.1:9190 check
 
 frontend http_in_443
     bind *:443  ssl crt /etc/easyhaproxy/certs/certbot/ alpn h2,http/1.1 crt /etc/easyhaproxy/certs/haproxy/ alpn h2,http/1.1